Issue on placing a Vuforia Model on realtime Object

Hi there,

I have integrated vuforia with hololens, I am trying to put my 3d models on top of my scan image or real time model which i am scanning.
But every time i scan the model my object is instantiate some where down.

I changed Y axis position in my object but that didnt solve my issue.

I tried spatial mapping also but have no idea how to keep my scanned model on top of my realtime model.

Please help me solve this issue!!!

Thanks.